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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7773a6516e4cfd3e580661de10858ba69c7a5a6b26f3debd41cdddaf9175fe7c' 
  AND token = '9JJ5hIq0Egh1I8Yel3G1FwM8vlUp5k7apnQy9+LTkKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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