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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7890e1ef18ce34beb3a55f9d2700ad84e9fbadaa74733aa3d38489b5b54a4260' 
  AND token = 'nn3LWZEppO6WHftY5EdlzgywjX1wjIWB8ltaJ4jNDvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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