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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6772ab8ebeb01bef6070a21d353aa7c0a10a8d3409509c8a3d1b2a3376de6684' 
  AND token = 'BfN4WR82wvxdbVOrzwd+7BYwiL2sFVLiPSccWcrBC80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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