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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ffe06a057899179c0564abd340ea899aa7f3c6ddd1d39d08d884c8959067f99' 
  AND token = 'YQJz46tmcS5z914Jlth/RNxaF71RU2OHxl0FUrzo5sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}