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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30561cbdc568a33ffad66727d427deba180afaa08c8c245ac32a6ea9dfba2922' 
  AND token = 'SwA0prsIyy9U90aWgCooHd5um33TkT0EKAOruGxiBMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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