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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b98f5549dea6ec9965e6595431513a16b361cab1efa18fb01f2b1bfd946d7719' 
  AND token = 'CzOJ9N+0owv46EWkvtpIvsuQGboeiSRecTa0bCYzjqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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