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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f2bfa0184d83e346bf3f09a9ae88363de4212efd0d9be61ff6262668789846f' 
  AND token = 'WhIkipzd5X1Go9CshiGh92nO5qPW3hUidTLpg9Sf4is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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