SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d042ef546576572a3f691e0b53af68d355e6d4ffa89e479405bcfb011b3c85b' 
  AND token = 'ZqXI7/7elk2p+JHVRX9t4scrv+CCMrIL308O9ggOAEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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