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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d788f2b9c11eaa216dbeeca9d72a1231a2fad9afce66c060ef35156a1d3641f' 
  AND token = 'ZhUMIsiZHCXLXQsJSwFirwbqMVR6hH4BTydTg4ikK0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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