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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '890ed4a63c1eb8fbffc20cdad691508b110d23d976f0c73457cecb358d166b04' 
  AND token = 'hqTx3gcBw67rEjm90yCqj00rZ3BtyCcHlpb0ZZdnL9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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