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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88c799d7ef7111c17184eb4cda342bbb9237de84fd5b10331e0fdc9de9d65c38' 
  AND token = 'xwaZc3//Ei4RFTmefOR/dxBjWjz+VxnNsn2gx47TSwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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