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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '227ae6cacbfc8f4eaafccaabae33f71edb2075aa714919d7df1e6a50d2f53f19' 
  AND token = 'cRy99jsArL2abh+r24PWxPT1lduPZzVKQBey7LCURKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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