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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c5e6124aed59ea919d243d60e97676a0bf07dc5ca793e7f526d7b7da4886fcc' 
  AND token = 'JUGoCvzYHgjaa5xpnRD3nvG9aohjs5cb1PIrNGNfU/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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