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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d3c83c9fa4e055f3a86987ad9a7c678228fe4aec8b93898c13643fc5b742b62' 
  AND token = '907aec5fVbyHW8wS0sxD4V4hwjoNi3ItSx9nTb7oZDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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