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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2668242fcfe11be6910667992a352abbaaddd6f199eeb5194ba37192ea5d6486' 
  AND token = 'bQH5Snu2U+AULNFQl4gsms7tnK4UBEXS6qaOKFD4AV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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