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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50501547b8e7f50a91501b637d10866198958c7d131b0e2197a2cf51c41db1cd' 
  AND token = 'SK43rLQsqx4hC9qJd9/20fWLmPErfA4iIEEMnvpgU+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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