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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c51db9770dee5ae57dcf0b0b15643915d0312a676bd0a9c3a7081d30740dd194' 
  AND token = 'ATQrHuPWwja/0xTQ+sRGAykVKZycihdD4HlzKt9vPZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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