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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd40cae26647827311a9d52d8f33b16912e008e42e81fc1b2176e5126df08d4e' 
  AND token = 'TCD8MVp/tmp/teZotjz0HgqOygJa96KxeYg27YN56p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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