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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7694b189c605ea1a90f1756b33996668fbb577ea728a04b857b8a72166a341c6' 
  AND token = '4EjVUZaqkUKdcalz21OX3c+dEAMGeHOvbqkMtJOCUFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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