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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88c042a9aefc906dda7de13a73b5b93851da8c48c1ca2cf3a7b41ba68c25237e' 
  AND token = '16AVLPpQAIocBUeUKFGMqpOeO9ufC7PjQ4IICgubc0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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