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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e39b2a5b917212dc9e2b26d04cc5024ce5840976349ea279d035b56a4d45a9b0' 
  AND token = 'gh3anQWDfNbYLjn8LA8I6NOUzv/Yp2T+efsW2U85Pz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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