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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd853faaed382ba946bf54b0c68e1910a8a91f3822ee9ce4007feb6c469ae305' 
  AND token = 'wLL8vR73DLJn+A0DfK8vVqJNi3+xTsArT0rc3THGnDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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