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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd474ae6f6e8bb3b833501454be5f11a79f5905f58f73cff3b81909496e1fa0c4' 
  AND token = 'sEvZ500uzyLvttHX/MCS2w47vdj6ybb6v+0GWggLVek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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