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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38dfc0b61be92f7299cce4f676016d2bab5a5824b561c452e2ae08b2ad5461cd' 
  AND token = '47DyzcveY/rIjgdMcWNQky0SCUlaXpt8HaXswNruPG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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