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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0951ba5a64b29dc11d04b6fa3abc4fff5a80623bf1b8afa45f11565c53b43eb' 
  AND token = 'LI652kz2v8BlI17FGDigAtiAZOaDDrL4JxD8eVpCaR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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