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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31894f7d988e39a709c9279a4f2917c76f68c6ede06e3c4e97268e1d965daf70' 
  AND token = '4xUadto/0t92n5yxC6hN++AcFiQn6q6C8KcaxwN3T3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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