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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd39763cb3d71e0adfc609083a25862975fb19b222af8279793d914a1450f6ff0' 
  AND token = 'UXa1oJ8B2aWt8+QY1cUWJatHF0SoXT7Rb7NfwZtzIQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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