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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ffb5a382b0b57aee4d9fd2cbce888256cc99a498933fea4c3f99ea3c990c477' 
  AND token = '3BO2varZl9vkit31CvmUQTq5jef+8+Q5u5E0YlQ8DRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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