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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52a4e8fcd0f672feba967d71ddec74978f8cdd30630d2204fb2035274ca82da7' 
  AND token = 'iUo5j9ByratZQ+vcm1JUcF18od31p1/cUmtqoGHhERQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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