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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36d9adebc74cc009b84defabeb3f5ab7d168c65509d2b4e4da4abc989bedcae8' 
  AND token = 'P9M/RirlNk+xLyGj/Rh/i8EhS71xsjVqIVdtEs7pIMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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