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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6740741bf10d219ea70aee2665bc56b03dc9160725869a21f7136146b848dec' 
  AND token = 'TJfpyUSfic7mDu1BIuaBp+MQbuH1TjXimHJCNKnDpTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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