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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ac2af3755b99bed1e6b2cf333530628d6159bd0fb8bbeef3aab0948330b8014' 
  AND token = 'Kg2wmThbTXk6dFV57IVnf/EJwE0ZwyVl1ff23Jy9ox8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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