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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6173987c65a50bf7360eda04ccd6d46a508280850cf8e183c09de4d5d95164c7' 
  AND token = 'xJdcAFexR0FFtU1gZQAUiwZ34hLbyuWCggrJCRuVCWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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