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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98d16ac76e1b90af2977af003ccddebeff5582e0cb7b1449ec9f1723056094c5' 
  AND token = 'EdAN8ciC/ICvYoP/RP/mOJ8ulCgJIYa0/k+K2aF8V5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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