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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c4243f068d84bbd2d3ec8cd1ea93f34d8b4b88e3ad8e8a69f0663997fe73064' 
  AND token = 'QuV94ZXKLq8s1paafGksZzc70drqIxUAUHRLjyW+kr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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