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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71bc540a2e28e23602613b10a3cabe77e262e06dc8f60eb54ed7028f8aa43b9d' 
  AND token = 'CoyyNZD5WqqdWLGV4FZz+2/wc5tkeA9v3KrB0eb+qxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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