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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cc4ea51c55203f1784d93f0fd72f4a1205f641091ebab09b4b7ee5f573a655a' 
  AND token = 'fXL8wKcCb3fpCAYn1EDjzshuT1w+7kVZa3tYlujIOoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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