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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d3748c6d5bd0f1b7ca407394c2b8422851dff8e6858d6e8ac6ebf409f8a289a' 
  AND token = 'MM3YzuI67FOOVPAQpMP7pCa3sT+iwLSwDVk8MFQXsjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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