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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0121cd06370a97f955e8f2c7ddb062d279002a5f3e08983c4dac3fcd4607296' 
  AND token = 'CB85b7+14UZL+NoRt5wkQTr+ble2GG/e9ozZWmOL8VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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