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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13b265811cf0df9fa1edd9dd19549c888e040558fad09f67c319ab9ed7b84f18' 
  AND token = 'cIEfeYRdBWjPG8QQ3xIFhYATtlUPlLkc3V8+n6RXsVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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