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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '535b97738bdff580cb761f0944bff6d010e74671dba2d82444f0729a3161ecf4' 
  AND token = 'Rcei6iigrKEtradA9eZEj9Vhqrjp6dGSelvRAGCqUXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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