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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaf859ec394fa42c6202195c40be0b2e88e7c9f88ce55c82c1bf4072f32a40f9' 
  AND token = 'YJihPLFuOO3Qf+F/HP30O4VZSDXHdFo4dBKrlmlhH9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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