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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '935d19453743e8a7e0ec15a0304c38e28cacef6638322203ee62b40ca50bbb60' 
  AND token = 'Avwokguea9aZZwfR1qFFEBQuB79Ui2SiIUjJJ19qpTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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