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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c9920724f34c2c56212328721f2406d8bab3f5c3a1a1f035c229cb0faf0149e' 
  AND token = 'ye/S+/RAAzjl6CiKafD2X9NgJ7lEJHn70K7uMg5S73M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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