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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cf6076a395d1ad152788932ca1327c5e8c9bf1eb937ae5638806cdb373ed7a6' 
  AND token = 'GA9hjkwcFgYNARcY5iySXrlhXnb7l3gV1Acn5LRxWj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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