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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddf91f7222c87fbe5a65ae97dbbeaabefad023c0284ecec8c788a6c9be12b74b' 
  AND token = '3uksgRBZfzvcJ6meQKhnPbSM/HRTYYbrAfs+zMXR/PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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