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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6941c9601c41c2dc9b8070ef1b00f3a651c9641a6c6b457142281eca2dc0296a' 
  AND token = '+6dALWEPkGuAJQk9B29YgP8/qjd+KKyy99X9gs9HSqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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