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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90baa359ceb258c0a6792b0675d43af4258bc65cb88c654a07208ce6f9b8aea9' 
  AND token = 'WB1ycTA8r+PaPBBlLy5IeT70whl3lhG/Bg1UpoFpW5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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