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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98caef82e4ad7795e27e2bbe519cb1ac867f1520a44c78dab3601d2bb1cd0ce2' 
  AND token = 'dlsdugbO/6rjWEH3kT1sFDQ+7x6n/uJsV2FxvUDf3ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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