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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb789f6c8771c2bda314b3a2986219ffaf7467307ddf61a8a5a7fa97a2cc48dc' 
  AND token = '/gV+fjIVkJ2mA4buEEkdJYoufnoHZxCZRo7AECa+JfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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