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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef131e1cd19b2e8f7eb7a5e50a772da44543a80e72224dff3596bdd1d2c43617' 
  AND token = 'fiQxwpNJ3Whh4I+OD5gq6lAaUJ8Xhpnl1yPbdpUVcEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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