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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aee031f2eb7d3e45f26161a641fc4d5de0cb8789cb186e9b1b6e83e732e2eabf' 
  AND token = 'qunfAgQGs7preBjJ1sgO127vBXTz73VoCQ3CHL5sIW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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