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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae1a914acf51510b24bbd4b3b3819f57f50d9bf13b6f8b2a1531ddc596d9bbdb' 
  AND token = 'yiIQ2YgV++MFul+ueDyy59RmHg9vZRFNA5mux19u8I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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