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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad832327a15e08706d0b3d4a803ea30bcbb4b9d3ae8cec86fd8c5bbc4acd4ce8' 
  AND token = 'CACP6EmLhyODMIWIUABB5xBjdFgGjRakGfvpD44pRVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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