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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '519a569c29fc6f98017252fedee78b57bd24f9856603d4833f0abbdb3bcd6b5e' 
  AND token = 'TEbemM5XPfgbKyuOu/dMoPDRDISU1LZuvlvAXc4IuVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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