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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9c22fc4c8824603b39d6fbe8f6939f7128fd44d3919a3c06cee9b029044aa15' 
  AND token = '7oTKm6CirXUc3NMsPXSeZpsGHqfZZAOrKb5t5l/1c+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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