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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2031427198581b9042685c0246caebd55b4a4b6d574de29de23137d376d246ce' 
  AND token = 'C11NOvuVlDK70q75aKEFG0KAMe02U2mHxv6yAcKGFqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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