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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1ebff821d54f9ea3df79f51cbbe2c7c07a34d943c16696ef322afd4cb5ba6d0' 
  AND token = 'a9NYg2vxkNkwiGwE64FLXLPAz0cHaa2lh0rHlLEriy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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