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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e84de46971851c4a68a42b71565f602c8a50f98752cf7f51615bca20d298d66d' 
  AND token = '/PHkg0INiaRsvVjkd08h6RDkc284LFjpc4A6U3ObSPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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