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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '912f8e0a7b0b2f6f37f280bf4bbce5c3b2f7032144111e9fbad6303eab7bd88e' 
  AND token = 'hDtiAICMjyu+4vn3JTkDdrP9UdwNZb7FuKXKsA1p1w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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