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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ce53e1b0935c61993bf880ac85956b37bc3704be44ef7d4866099f5056510d4' 
  AND token = 'OVO49dup5Rca5RyyLDs7f6KP/oTf3koxhWQujY2xHn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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