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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea98ebd647e5a0ae9c02f6bbb5f12bd0e39e2d7576fb669a7af32ef1329ea757' 
  AND token = 'bc7+Cuc3Pnc5pFdNOc/ajbmVJnvFk4BvvvtEd6c7Mb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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