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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e0e0d30f41ea9cbd4776e7f1fec5e8ece3b08f046fa331cc98b697cb6843ac1' 
  AND token = 'jea4EH18/Kh/A03jblpcLdCpuxhonIKXxNwapMTO3U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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