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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4dc8542d9fdbc903fa672f49478c5cbee03298f7d7403c4efa046dd4c86d299' 
  AND token = 'qZI2kRQw2Z1EtJSXTYBlLczKfyeE6ge6G5b6LK2zwBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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