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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '201a511706fccc0ac00ee153a92a328d9750c488d2cdfcca3b1a8ce77b83b8d5' 
  AND token = '6Ywhe6Jy9viJjPwM/ORkMrwiOijedbPewJrOwmW3jC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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